1) My original firmware version in tv it was T-MST14DEUC_2770.0
2) Next tv autoupdate to T-MST14DEUC_2890.2
3) I downloaded version T-MST14DEUC_0000.0 and downgrade my tv
4) I disable firmware updates in service menu
5) I downloaded version T-MST14DEUC_2130.0 and upgrade my tv
But what then ? -> Skype root method (T-MST14DEUC_2130.0).
Where is this method described for H6400 ? -> give me post please.